At this point, it is an overused joke. Someone in a movie steps up to a microphone to say something serious or awkward, and when they start talking, a screeching sound can be heard. For as rote as it ...
The pulse of a microphone turned into a living loop produces an unmistakable scree­ching line that lingers in the air, filling the room with a cascade of harmonics. The pure tone is layered with ...